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Investigators said in many of the incidents, the robber approached the register, bought an item, then pulled a gun from his waistband and demanded money from the clerks.

"We've got at least one individual who announces the robberies, displays a handgun and has been able to get away with the goods," FBI agent Patrick Dugan said.

The robber took cash and some video games.

Dugan said he acts quickly, within a matter of minutes. Sometimes the clerk is alone during the robbery; other times, customers have been present.

Authorities said the robber has struck at the following businesses:

Aug. 4: Radio Shack at 5022 Sinclair Lane in Baltimore

Aug. 10: CVS at 6635 Bel Air Road in Baltimore

Aug. 15: GameStop at 5114 Sinclair Lane in Baltimore

Aug. 21: Petco at 6325 York Road in Towson

Aug. 23: Petco at 7615 Harford Road in Baltimore

Aug. 26: Petsmart at 1559 Merritt Blvd. in Dundalk

Sept. 5: Earth Origin at 7006 Reisterstown Road in Baltimore County

Sept. 6: Radio Shack at 5022 Sinclair Lane in Baltimore

Sept. 9: Petco at 8640 Pulaski Highway, Baltimore County

Sept. 10: Radio Shack at 2400 Boston St. in Baltimore

Sept. 11: Radio Shack at 7617 Harford Road in Baltimore

Sept. 18: Movie Stop at 1238 Putty Hill Ave. in Towson

Sept. 20: Radio Shack at 1034 W. 41st St. in Baltimore

Sept. 21: GameStop at 5114 Sinclair Lane in Baltimore

Witnesses describe the robber as a black man, in his late 30s or early 40s, about 6 feet 2 inches tall, medium to stocky build, with a dark complexion and graying hair and goatee.

"(He's a) lone individual. He's pretty tall and has been described as over 6 feet tall, 6 feet 2 inches and has a muscular build," Dugan said.

Dugan said the man has graying hair and gray in his goatee and has been seen wearing distinctive clothing in which he was pictured on surveillance video. The man carries a dark-colored pistol and is pretty aggressive.

"In several of the robberies, we've seen similar clothing, either ball caps, shirts or some other items of clothing that have been consistent," Dugan said.

Anyone with information about the robber or any of the robberies is asked to call the Baltimore Division of the FBI at 410-265-8080. Tipsters could receive a reward of up to $5,000 for information leading to an arrest in these robberies.